Overlay: Added top/right margins around hidden header's close button in SCSS.
Fixes gh-4130.
Merge pull request #4141 from EricDunsworth/v4.0-overlay-hidden-hd-margins

Overlay: Added top/right margins around hidden header's close button in ...
Site: Add custom 404 page
Datepicker: Added extra checks and renamed an event to prevent the JS errors (partially fixes #4135)
Merge pull request #4139 from pjackson28/fixdatepickeroutsidecheck

Datepicker: Added extra checks and renamed an event to prevent the JS errors (partially fixes #4135)
Merge pull request #4142 from nschonni/v4-404-page

Site: Add custom 404 page
WET theme: Moved WET logo to the top bar in small view and under (fixes #4133)
Merge pull request #4147 from pjackson28/fixwetlogosmallscreens

WET theme: Moved WET logo to the top bar in small view and under (fixes #4133)
Menu: Fixed jumpiness when menu bar is clicked with a mouse
Merge pull request #4148 from pjackson28/fixmenubarclickjump

Menu: Fixed jumpiness when menu bar is clicked with a mouse
Menu: Made mobile panel menus behave like accordions (only one menu item open at a time per menu)
Merge pull request #4153 from pjackson28/mobilepanelaccordion

Menu: Made mobile panel menus behave like accordions (only one menu item open at a time per menu)
WET theme: Fixed positioning of WET logo in small view and below
Merge pull request #4154 from pjackson28/tweakwetlogosmallview

WET theme: Fixed positioning of WET logo in small view and below
Fixed noscript/wb-disable handling for plugins and polyfills
Merge pull request #4155 from pjackson28/cleanupnoscriptwbdisable

Fixed noscript/wb-disable handling for plugins and polyfills